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Finding the Fourth Proportional to 873.30, 1,205.11 and 480.31

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Solution

The fourth proportional to 873.30, 1,205.11 and 480.31 is: 662.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.30 : 1,205.11 = 480.31 : x
  2. Step 2: Convert to fraction form
    873.30/1,205.11 = 480.31/x
  3. Step 3: Cross multiply
    873.30x = 1,205.11 × 480.31
  4. Step 4: Simplify right side
    873.30x = 578,826.38
  5. Step 5: Solve for x
    x = 578,826.38/873.30
  6. Step 6: Final answer
    x = 662.80

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.